Now that Windows 10 for PCs has shipped out the door, all eyes are squarely focused on Windows 10 Mobile, which is expected to launch later this year. Microsoft isn't quite ready to release the OS to manufacturers, but the latest Insider Preview build certainly adds a lot of polish.

The Windows 10 Mobile Preview build 10512 is the first update to the operating system since build 10166 over a month ago. Microsoft has been saying for a few weeks now that Windows 10 Mobile is "significantly feature complete", so it's not surprising to see this build come with essentially no new features.

What build 10512 does bring is general improvements to the performance and stability of the operating system on a wide range of hardware. There are also a collection of fixes for bugs and other issues that users had reported while using previous builds, as well as improvements to features such as Kid's Corner, Data Sense and Shape Writing:

General improvement in overall stability and performance.

You can now set the Lock screen and background image from within the Photos app.

We fixed an issue where apps installed on SD cards weren’t working after a reboot.

We have improved Latvian and Chinese inputs.

We have made improvements to the Kid’s Corner tile layout.

We have improved reliability of Data Sense notifications.

Modified Shape Writing algorithm to be less aggressive in suggesting contact names over common words.

Resolved an issue where Camera would not launch when the phone was locked.

We fixed an issue where notifications for incoming text messages weren’t appearing.

We fixed an issue where the touch screen wouldn’t be responsive after ending a phone call on some devices.

And we fixed an issue where folder tiles have obviously overlapping text.

There are some known issues with the latest build that will affect the experience, which is why the OS is only being released through the Fast Ring. Video playback, for example, is completely broken, as is phone number-based two-factor authentication for Microsoft accounts.

If you're interested in what Microsoft has polished in this build, go ahead and download it now through the usual update process. And stay tuned for the next Windows 10 Mobile preview build, as it looks like there will be some major improvements to Microsoft's Edge browser to look forward to.